I'm new to this sight and have never joined a forum till now. I figured it was time that I ask for help from fellow FMJ drivers and perhaps offer some of what I have learned from driving these old cars for the past 17 years. My situation is that I am having a dual exhaust system made for my 78 town and country wagon and I'm trying to chose the right manifold. The engine that will be in the car is the rebuilt motor from my 87 Fifth Ave. The motor will be mostly stock with the exception of an improved intake and a Holley 390 CFM 4BL. Originally the 87 318 had a air pump but I would rather not transfer that mess. What I'm thinking is to use the 87's stock manifold and create an air aspirator system for each bank of exhaust using a check valve on each side. I'm thinking about this because I'm going to install 2 new catalytic converters before 2 glasspacks that will dump out in front of the rear tires. I drive this car in the city a lot and I'm thinking that the aspirator system will help the converters work better under low RPM where they might otherwise struggle for oxygen. My other manifold option is from a 74 318 and has no air inlets, just better flow. To use that one I would have to block the small exhaust/air holes in the 302 heads. Has anyone out there been down this road or have anyadvice.